Microsoft Word Course Control valves R. doc

Is the velocity of a fluid in a control valve critical

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Control Valves Basics - Sizing & Selection
FMD3x00 98 DB Initialize (5), configuration-and-evaluation-software-pi-9045582-en-gb, configuration-and-evaluation-software-pi-9045582-en-gb, Document, colour present

9. Is the velocity of a fluid in a control valve critical
The velocity is one of the most important considerations in sizing a control valve. For long life on liquid applications the velocity at the exit of the valve body should be less than 10 ms. This compares with generally accepted line velocities of about 3 ms, which explains why control valves often are smaller than the line size. On gases and vapors the velocity at the exit of the valve body should be less than
0.33 Mach (rd of sonic) for noise control valves and less than 0.5 Mach where noise is not a consideration.

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